body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background: #f0f0f0;
    font-family: 'Microsoft YaHei', sans-serif;
}

.game-container {
    text-align: center;
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

canvas {
    border: 1px solid #333;
    margin: 20px 0;
}

.difficulty button {
    padding: 10px 20px;
    margin: 0 5px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    background: #4CAF50;
    color: white;
    transition: background 0.3s;
}

.difficulty button:hover {
    background: #45a049;
}

.status {
    font-size: 1.2em;
    color: #333;
    height: 24px;
}
